Free Printable Quiz on Digital E and Basic E

1.

Which Logic gate does this Truth Table represent?

a)

AND Gate

b)

OR Gate

c)

NOT Gate

d)

NAND Gate

2.

NAND Gate is called a universal logic element, because

a)

It is used by everybody

b)

Any logic function can be realised by NAND Gate alone

c)

Many digital computers use NAND Gate

d)

All the minimisation techniques are applicable to optimum NAND Gate realisation

3.

Which are the UNIVERSAL GATES?

a)

XOR Gate & NOT Gate

b)

AND Gate & OR Gate

c)

NAND Gate & NOR Gate

d)

All of the above

4.

The two inputs of a NAND gate are both low (logic level 0). The output state is...

a)

1

b)

0

5.

symbol for a NOT gate?

a)

b)

c)

d)

6.

The base of octal number is

a)

2

b)

8

c)

10

d)

11

7.

The number 15 is represented as ............in Hexadecimal.

a)

C

b)

E

c)

F

d)

D

8.

The number 5A6D belongs to which category of number system

a)

Octal

b)

Hexadecimal

c)

Binary

d)

DEcimal

9.

3) The boolean expression of an OR gate is _______

a)

a) A.B

b)

b) A’B+AB’

c)

c) A+B

d)

d) A’B’

10.

Which of the following statements is TRUE for an OR Gate:

a)

A '1' at any of the inputs causes the output to be '1'

b)

A '1' at any of the inputs causes the output to be '0'

c)

A '0' at any of the inputs causes the output to be '0'

d)

A '0' at any of the inputs causes the output to be '1'

11.

The inputs of a NAND Gate are connected together. The resulting circuit is .............

a)

AND Gate

b)

OR Gate

c)

NOT Gate

d)

None of the above

12.

Decoder is a

a)

combinational circuit

b)

sequential circuit

c)

complex circuit

d)

gate

13.

What type of Flip-Flop is pictured here?

a)

J-K

b)

D

c)

S-R

d)

Toggle

14.

Which truth table is this?

a)

XOR

b)

NAND

c)

NOR

d)

NOT

15.

A circuit with one input and many outputs

a)

Multiplexer

b)

Demultiplexer

c)

None of the above

16.

One's compliment of 1011

a)

0101

b)

1000

c)

0100

17.

Binary equivalent of $13_{10}$

a)

1101

b)

1111

c)

1010

18.

Decimal equivalent of $\left(1100\right)_2$

a)

10

b)

12

c)

8

19.

If A, B and C are the inputs of a full adder then the sum is given by __________

a)

A AND B AND C

b)

A OR B AND C

c)

A XOR B XOR C

d)

A OR B OR C

20.

If A and B are the inputs of a half adder, the sum is given by __________

a)

A AND B

b)

A OR B

c)

A XOR B

d)

A EX-NOR B

21.

Total number of inputs in a half adder is __________

a)

1

b)

2

c)

4

d)

3

22.

The logic circuits whose outputs at any instant of time depends only on the present input are called ________________

a)

a) Combinational circuits

b)

b) Sequential circuits

c)

c) Latches

d)

d) Flip-flops

23.

Identify the name of this gate

a)

NAND Gate

b)

NOR Gate

c)

X-OR Gate

d)

Ex-NOR Gate

24.

To work as a Amplifier, the transistor has to be operated in

a)

Cut off region

b)

Saturation region

c)

Active region

d)

All of the above

25.

In CB configuration, the value of α is

a)

$\frac{I_C}{I_E}$

b)

$\frac{I_E}{I_B}$

c)

$\frac{I_B}{I_C}$

d)

$\frac{I_E}{I_C}$

26.

The efficiency of a centre-tapped full wave rectifier is;

a)

50%

b)

46%

c)

70%

d)

81.2%

27.

Addition of pentavalent impurity to a semiconductor creates _____.

a)

Free Electrons

b)

Holes

c)

Valence Electrons

d)

Valence Ion

28.

Relation between Alpha and Beta is

a)

$\alpha=1+\beta$

b)

$\beta=\alpha-1$

c)

$\beta=\frac{\alpha}{1-\alpha}$

d)

$\alpha=\frac{\beta}{1-\beta}$

29.

$V_{dc}$ in halfwave rectifier

a)

$\frac{V_m}{2}$

b)

$\frac{V_m}{\sqrt[]{2}}$

c)

$\frac{V_m}{\pi}$

d)

$\frac{V_m}{\sqrt[]{\pi}}$

30.

The maximum amount of reverse voltage which can be applied on a diode before breakdown is reached

a)

Zener Voltage

b)

Peak Inverse Voltage

c)

Breakdown Voltage

d)

Threshold Voltage

31.

In a Transistor ………………..

a)

I_E = I_C + I_B

b)

I_C = I_E + I_B

c)

I_E = I_C – I_B

d)

I_B = I_C + I_E

32.

The Base – Emitter Diode (Base – Emitter Junction) in an NPN Transistor is

a)

A. Doesn’t conduct

b)

B. Forward Biased

c)

C. Reverse Biased

d)

D. Operates in breakdown region

33.

In transistors conduction occurs due to the flow of

a)

Minority charge carriers

b)

Majority charge carriers

c)

Both majority and minority charge carriers

34.

The base region of a transistor is doped:

a)

Heavily

b)

Moderately

c)

Lightly

d)

None of the above

35.

The net charge of an N-type semiconductor is

a)

Negative

b)

Zero

c)

Positive

d)

Dependent

36.

A semiconductor in its purest form is called.......

a)

Extrinsic semiconductor

b)

Superconductor

c)

Intrinsic semiconductor

d)

Insulator

37.

The depletion layer of a PN junction diode has

a)

Only free mobile holes

b)

Only free mobile electrons

c)

Both free mobile holes as well as electrons

d)

Neither free mobile electrons nor holes

38.

The color of light emitted by a LED depends on

a)

its forward bias

b)

its reverse bias

c)

the amount of forward current

d)

the type of semiconductor material used

39.

The advantage of LED is

a)

Long life

b)

Fast on-off switching

c)

Low operating voltage

d)

All of the above

40.

The potential difference created across the P-N junction due to the diffusion of electrons and holes is called___________

a)

back emf

b)

depletion voltage

c)

barrier potential

Quiz on Digital E and Basic E

Total questions: 40

Worksheet time: 19mins

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